It may happen both shift may not same class so We have to set class on shift. This data store classOnShift table only contain class and shift foreign key. When we show it on data table it will show corresponding Shift and Class name. At the time of adding class it will not add same class twice time on a section and update. Table data change when we change Shift from Combo.
It would be an advantage for that we will not delete any class data from this table. We will add an flag at table level for active or inactive. Just active data class will show when we will go to add any section or more work from this table. But in this page all Class will show with current status(Active or Inactive).

1. A room list is visible in data table when we select a building.
2. If we select from combo building and Room Used Type then it will visible on Both matches Data in Data Table.

after truncate room info table respective grid not initialized.
please check find out problem

Shift combo is ok, but select class combo value will come from classOnShift table only that class which is added under selected shift and has an active flag. We will prevent duplicate value added. Edit option have to add with class changes and same time we will use active or inactive flag as a replace of delete.

Data will show on datatable with shift, class and Section name. it will also change after combo value changes. Present table column is not ok.